Route guide · 1,044 miles
Cheap Flights from St. Louis to Boston
STL → BOS · Nonstop 2h 37m · Live round-trip fares
Looking for cheap flights from St. Louis to Boston? You're in the right place. Airfare Deal tracks live fares on this 1,044-mile route around the clock. As a rule of thumb, booking 3–6 weeks ahead lands the best prices — and a free fare alert means you never have to keep refreshing the page.
Live fares for STL → BOS are updating. Use the search below for real-time prices.
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See live fares
Updated daily
Flight time
2h 37m
Nonstop, typical
Distance
1,044 mi
STL → BOS
Book ahead
3–6 weeks
Best window, typically
Nonstop airlines
1
Southwest Airlines
Nonstop flights from St. Louis to Boston
The fastest way between the two cities is the nonstop: about 2h 37m for the 1,044-mile run from STL to BOS. Those flights are flown by Southwest Airlines. Prices behave best when you book 3–6 weeks out.
Booking insights: St. Louis → Boston
- Distance: 1,044 miles · nonstop flight time: 2h 37m.
- Cheapest upcoming week in the live data starts around Nov 19, with fares from $166.
- Fares tend to bottom out when you book about 3–6 weeks ahead — earlier than that rarely helps, later usually hurts.
- Midweek departures (Tue–Thu) are consistently cheaper than weekend flights.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
Price trend
Cheapest departure weeks ahead
Departing around Nov 19 is currently the cheapest window — about $50 less than the nearest weeks. Based on recent fares found for this route; prices change quickly.
Cheapest month · St. Louis → Boston
November 2026
Every date's recent round-trip fare, at a glance.
Fares from
$166
Cheapest: Sat, Nov 21 — $166
Get this fare →Recent fares found for specific dates in November 2026. Blank days had no recent fare in our data — ask our team and we'll check them for you.
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Flying from St. Louis to Boston: what you need to know
The flight
The nonstop from STL to BOS runs about 2h 37m over 1,044 miles. It's a comfortable mid-range flight: long enough that seat choice matters a little, short enough that paying up for extras rarely does.
Airlines on this route
Southwest Airlines flies this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from St. Louis (STL)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our St. Louis airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Boston (BOS)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The Boston airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Boston to St. Louis fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 1,044 miles, booking 3–6 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Download the airline's app before you fly; gate changes and delays show up there first.
- Nonstop time on this route is about 2h 37m — a one-stop itinerary needs to be a lot cheaper to be worth the extra hours.
- Tuesday and Wednesday departures are typically the cheapest days on domestic routes.
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
- Flexible dates? Search a few days either side — one day can change the fare a lot.
St. Louis to Boston flight FAQs
How long is the flight from STL to BOS?
Nonstop flights from St. Louis to Boston take about 2h 37m and cover roughly 1,044 miles. One-stop itineraries add 2–4 hours depending on the layover city.
Are there nonstop flights from St. Louis to Boston?
Southwest Airlines typically operate nonstop flights from STL to BOS. Nonstops are usually cheapest when booked 3–6 weeks ahead of departure.
What is the cheapest month to fly from St. Louis to Boston?
Travelers usually find the gentlest prices away from peak periods — think post-holiday January and the early-fall weeks. Midweek dates inside those windows are cheaper still.
How much are last minute flights from STL to BOS?
Last-minute flights from STL to BOS (booked within 7 days of departure) typically cost noticeably more than fares booked 3–6 weeks out. Booking early is the smarter move.
What is a good round-trip deal from St. Louis to Boston?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from St. Louis to Boston?
You'll mainly see Southwest Airlines on St. Louis to Boston. Checking each against the live fares below is the surest way to find the lowest price for your dates.
How early should I get to St. Louis airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
More cheap flights from St. Louis
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